---
title: dispatch_qos_class_t
framework: dispatch
role: symbol
role_heading: Type Alias
path: dispatch/dispatch_qos_class_t
---

# dispatch_qos_class_t

Quality-of-service classes that specify the priorities for executing tasks.

## Declaration

```occ
typedef qos_class_t dispatch_qos_class_t;
```

## See Also

### Thread Scheduling

- [dispatch_queue_priority_t](dispatch/dispatch_queue_priority_t.md)
- [dispatch_set_qos_class_floor](dispatch/dispatch_set_qos_class_floor.md)